Here's the answer Graboid customer service gave me when I asked that question so I think we're out of luck. Not much help I'd say.
Mon, May 4, 9:32 PM (4 days ago)
When will Graboid be coming out with a 64 bit upgrade/version that will run with MacOS Catallina?
Graboid Support email@example.com
Mon, May 4, 10:44 PM (4 days ago)
Thank you for your message.
I do not have any information on when/if that will be done.
Please let me know if there is anything else I can help you with.